Mechanism for sharpening rock-drills.



PATENTED MAY 2, 1905.

W. P. LIGHTBODY. MECHANISM FOR SHARPENING ROCK DRILLS.

APPLICATION FILED JAN. 21, 1903.

2 SHEETS-SHEET 1.

No.788,919. PATENTED MAY 2, 1905. W. P. LIGHTBODY.

MECHANISM FOR SHARPENING ROCK DRILLS.

APPLICATION FILED JAN 21. 1903.

2 SHEETS-SHEET 2.

tilt- 1" 5- gJ K FEE 5%? W L 9 0'76; 0801/25 J NITED STATES Patented May 2, 1905.

PATENT OFFICE.

MECHANISM FOR SHARPENING ROCK-DRILLS.

SPECIFICATION forming part of Letters Patent No. 788,919, dated May 2, 1905.

Application filed Ja a y 21, 1903. Serial No. 139,930.

1'0 all whom it may concern:

Be it known that I, WILLIAM PARR LIGHT- BODY, a subject of the King of Great Britain, and a resident of Llanglaagte Deep, Box 1056, Johannesburg, Transvaal, but at present of Beehive Works, Bolton, in the county of Lancaster, England, have invented certain new and Improved Mechanism for Sharpening Rock-Drills, of which the following description, together with the accompanying sheets of drawings, is a specification.

My invention relates to mechanism for use in the sharpening of rock-drills of the class wherein the cutting edges converge so that they form a kind of cross, the bar of metal out of which they are produced having, therefore, four ribs; and my said invention consists in the production of mechanism of such a description that I am enabled to force or draw outwardly the converging edges of the ribs to fill out the parts worn away from their extending edges during use, and thus form new cutting edges.

In carrying my invention into effect] make use of the mechanism illustrated by the accompanying sheets of drawings, in which- Figure 1 is a part-sectional side elevation of my improved machine. Fig. 2 is a plan of parts shown by Fig. 1 with a certain part removed. Fig. 3 is a sectional side elevation, drawn to an enlarged scale, of the holding parts or sows, in which the drills are placed to be acted upon by the fullers, as hereinafter described. Fig. 4 is an end elevation thereof. Figs. 5, 6, and 7 are detail drawings of the fullers, same scale as Figs. 3 and 4:. Fig. 8 is a drawing in detail of one of the drills to be operated upon.

B indicates the framework of the machine. Upon this framework B and in bearings a a I mount the machines driving-shaft a, which derives its rotary motion from any prime motor bya driving-belt passing round its driving-pulley 6. Fixed upon the shaft (4 are the disks 6' b b 72*, carrying the series of fullers c and (Z, which are hinged or mounted upon them, freedom of action being allowed between their respective stop-pins 2 and 3, the former arresting them on one side in one direction, the latter on the other side in the other direction. In Fig. '2 only a portion of the fullers c and cl and stop-pins 2 and 3 are shown for the sake of clearness.

The series of fullers c are for acting upon one size of drill and the fullers dupon another size, while the hammers are for a purpose hereinafter described. The number of fullers in any series may be varied as may be found necessary, eight of such being shown by Fig. 1, and their order of action commences with the one, as at c, and finishes with that at 0 By comparing Fig. 6 with Fig. 7 it will be noted that the striking-surface of the fuller 0 is close to the inner edge of said fuller, while the striking-surface of the fuller c is at the extreme outer edge. The striking-surfaces of the intervening fullers are so positioned relative to the fullers c and c that they will successively strike the drill at all points intermediate of those portions of the drill acted upon by the strikingsurfaces of the fullers illustrated in said figures. In other words, the fullers 0 act upon the central portion of the drill, and the striking-surfaces of the remaining fullers are sucsessively located nearer the outer edges until the fullers c are reached, the striking-surfaces of the latter, as before stated, being at the extreme outer edge.

It is obvious that if more than two sizes of drills are to be acted upon I shall require and may use a correspondingly-increased number of series of fullers.

Taking it that the machine is in motion and that a drill has to be subjected to the fullers c, it is placed upon the sow f, as shown in broken lines, Figs. 3 and 4, and manually pressed forward into the path of motion of the fullers 0 (said sow f being carried with it by reason of the groove therein tapering toward its rear end) during the time that the vacant part between 0 and c is passing said sow. When in this position, the first fuller 0 will strike the inserted end of the drill, and such blow will be followed by a similar blow from each of the others in succession until the last 0 is reached, on which the drill is withdrawn, given a quarter-turn, and reinserted. The striking-surface of each successive fuller c is so formed that the first 0 to act or strike upon the drill (see Figs. 5 and 6) does so at a point or part 5 nearly approaching the joining edges of the ribs g of said drill, while each succeeding fuller directs its blow a little nearer the outer edges thereof. After all of said fullers have acted upon the drill the whole surface of the latter from the point 5 to that at 6 of the two opposite ribs g has been acted upon, and the metal is thereby forced from the central parts at 5 to fill the worn places at 6, as shown by Fig. 8. The withdrawal and turning of the drill through a quarter of a revolution and reinsertion of same into the sow f is to bring the next or succeeding edges into position to be acted upon. By reference to the end elevation of the sow, as illustrated by Fig. 4:, and the formation of each end of the series of fullers c or d it will be observed that only two ribs (and those that are opposite sides) of the drill are acted upon at one and the same time. The sow f is so constructed as to retain the other ribs, as well as those being thus treated, in their exact position, so that only those parts desired to be forced into shape can possibly be struck by the fullers. The

' fullers c and cl have parts, as those marked 0 cut away so that they may pass over the upper vertical wing g of the drill under treatment.

In order that the drill may not be presented to the fullers 0 (or d) except at the proper time, so as to be acted on by that 0 for the first blow and the one 0 for the last blow, I arrange a stop-flange it to project from the face of the disk 5 and to extend in a circular direction for a certain distance, leaving an open space at the part opposite to the space intervening between the fullers 0 and 0. The forward end h of said flange is inclined and at the opposite extremity thereof said flange is provided with a deflecting-cam b Upon the shaft f around which the sows foscillate, are fixed the arm is 10 of the lever is, (see Fig. 4:,) so that when either of the sows f for the fullers c or d is pressed forward, as hereinafter described, this lever is also moved.- Said lever in its'forward movement contacts with and actuates the rod or bar m, on which the projection m is fixed. In its normal position this projection m lies beyond the periphery of the flange it against the face of the disk 6. By this arrangement any forward movement of the bar m, and consequently the lever is and sow f, to present a drill for treatment by the fullers will be interrupted by reason of the projection m coming in contact with the flange it except at the time that a part of the space intervening between the parts It and [t2 of said flange is opposite to the said projection m. Hence as the revolution of the disk 6 brings this space opposite to said projection m the latter is allowed to be moved (by the operator pressing the drill and sow f toward the fullers) into the path of motion of the flange it. As the projection m rides up the incline It the bar on is deflected until the cam b is reached, when the projection m and bar m are moved longitudinally, so as to occupy their normal positions, at the same time forcing the sow f and the drill therein out of the path of motion of the fullers 0 or CZ. The projection m is held against the disk 6 or flange h by means of the spring 02, which presses against the bar 172 and lip 0 of the cap or guide 0 (shown in broken lines, Fig. 2, and in full lines in Fig. 1) while said bar on always tends to return to its normal or inoperative position by the pressure thereon of the weighted lever q. The longitudinal and swiveling movements of the bar on are allowed by its taking through the eyeboltp, mounted upon the bearings p.

The hammers a may be employed at any time to operate upon the edges of the wings g of the drills, as may be found necessary.

The drills subjected to the actions of my improved mechanism may afterward be finished by any suitable well-known means.

Having thus described the nature and object of my invention, what I claim is- 1. A machine of the character described comprising a rotary support, and a series of fullers mounted thereon and having their successive striking-surfaces arranged in relatively different positions.

2. A machine of the character described comprising a rotary support, a series of fullers mounted thereon and having their successive striking-surfaces arranged in relatively different positions, means for rotating said support, and means for holding the drill in position.

3. A machine of the character described comprising a rotary support, a series of fullers mounted thereon, a movable support for the drill, and means whereby said drill-support is prevented from movement except at predetermined periods.

4. A machine of the character described comprising a rotary support, a series of fullers mounted thereon, a flange mounted on said rotary support, a movable support for the drill, and a locking-bar interposed between said drill-support and said flange.

5. A machine of the character described comprising a rotary support, a series of fullers mounted thereon, a flange mounted on said rotary support, a pivoted support for the drill, a lever mounted on the pivot of said support, and a locking-bar engaging said flange and lying in the path of movement of said lever.

6. A machine of the character described comprising a rotary support, a series of fullers mounted thereon, an interrupted flange mounted on said rotary support, a movable support for the drill, and a locking-bar adapted to be operated by said drill-support and having a pin adapted to engage said flange.

7. A machine of the character described comprising a rotary support, a series of fullers mounted thereon, an interrupted flange mounted on said rotary support, a pivoted support for the drill, a lever mounted on the pivot of said latter support, a locking-bar lying in the path of movement of said lever and having a pin adapted to engage said flange, and means for holding said locking-bar in a normally forward position.

8. A machine of the character described comprising a rotary support formed of a plurality of disks, and a series of fullers mounted between said disks and having their successive striking-surfaces arranged in relatively different positions.

9. A machine of the character described comprising a rotary support, formed of a plurality of disks, a plurality of series of fullers mounted between said disks, the striking-surfaces of the fullers of each series being arranged in relatively difierent positions.

In testimony whereof I have aflixed my sig nature in presence of tWo Witnesses.

WILLIAM FARR LIGHTBODY.

I/Vitnesses:

SAMUEL HEY, JOHN WHITEHEAD. 

